loginaction.java

仓库管理系统毕业设计论文最好的参考资料！

package com.qhit.action;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.qhit.UseException;
import com.qhit.db.instance.DbSyUser;
import com.qhit.po.SyUser;

public class LoginAction {
	private DbSyUser dbSyUser;
	
	/**
	 * 构造方法初始化跟数据库的操作类：DbSyUser
	 * @throws UseException
	 */
	public LoginAction() throws UseException{
		dbSyUser = new DbSyUser();
	}
	
	/**
	 * 用户登陆操作
	 * @throws IOException 
	 * @throws ServletException 
	 */
	public void login(HttpServletRequest request,HttpServletResponse response) throws Exception{
		String userid = request.getParameter("userid");
		String password = request.getParameter("password");
		try{
			if(userid == null || "".equals(userid)||password == null ||"".equals(password)){
				throw new UseException("用户名密码不能为空！");
			}
			SyUser su = new SyUser(userid);
			su.setPassword(password);
			
			List list = dbSyUser.query(su);
			if(list == null || list.size() == 0){
				throw new UseException("可能用户名密码不正确！");
			}else{
				request.getSession().setAttribute("userid", userid);
			}
		}catch(Exception e){
			e.printStackTrace();
			request.setAttribute("error", "执行登陆操作出错，原因：" + e.getMessage());
		}finally{
			dbSyUser.closeAll();
			Object obj = request.getSession().getAttribute("userid");
			if(obj == null){
				request.getRequestDispatcher("login.jsp").forward(request, response);
			}else{
				request.getRequestDispatcher("success.jsp").forward(request, response);
			}
		}
	}
	
	/**
	 * 用户退出操作
	 * 把保存在Session里的用户对象清空,使Session无效
	 * 转到仓库管理的首页
	 */
	public void logout(HttpServletRequest request,HttpServletResponse response) throws Exception{
		request.getSession().invalidate();
		response.sendRedirect("../index.jsp");
	}
}